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Published October 2007 | public
Journal Article

Halo ejection in distant radio galaxies: jet feedback in massive galaxy formation


We present results from a Keck optical and near IR spectroscopic study of the giant emission line halos of the z > 3 High Redshift Radio Galaxies (HiZRGs) 4C 41.17, 4C 60.07 and B2 0902+34. The outer regions of these halos show quiet kinematics with typical velocity dispersions of a few hundred km s^(−1) and velocity shears consistent with rotation. The inner regions contain shocked, clumpy cocoons of gas closely associated with the radio lobes with disturbed kinematics and expansion velocities and/or velocity dispersions > 1000 km s^(−1). We also find evidence for the ejection of chemically enriched material in 4C 41.17 up to a distance of ~60 kpc along the radio-axis. We infer that these HiZRGs are undergoing a final jet-induced phase of star formation with the ejection of most of their interstellar medium before evolving to become "red and dead" Elliptical galaxies.

Additional Information

© 2007 Springer. Received: 1 March 2007. Accepted: 3 June 2007. Published online: 2 August 2007. This work was performed under the auspices of the U.S. Department of Energy, National Nuclear Security Administration by the University of California, Lawrence Livermore National Laboratory under contract No. W-7405-Eng-48. M.D. acknowledges the support of the ANU and the Australian Research Council (ARC) for his ARC Australian Federation Fellowship, and also under the ARC Discovery projects DP0208445, DP0342844 and DP0664434.

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August 22, 2023
October 20, 2023